Forces review

Forces review

Multiple Choice

Look at the picture.

Why does the girl in the picture weigh less on the moon than on Earth?

• The force of gravity on the Moon is stronger than gravity on Earth

• The force of gravity on the Moon is weaker than gravity on Earth

Multiple Select

The sun and the moon cause the movement of:

• tides

• clouds

• planets

Multiple Choice

Air resistance ____________ falling objects

and __________________.

• pushes against ; speeds them up

• pulls against; keeps them afloat

• pushes against; slows them down

• pushes against; spins them

Multiple Choice

The less streamlined an object is, the...

• More air resistance

• Less air resistance

• Slower air resistance

• Faster air resistance

Multiple Choice

Look at the pictures of the cars.

Which vehicle will have the most air resistance force acting upon it?

They will be moving at the same speed.

• All will have equal air resistance force.

Multiple Choice

Friction _____________ motion

• Works in the same direction as

• Opposes

• Has not effect on

• Pulls against

Multiple Choice

True or False: objects that are smooth have LESS friction than objects that are rough

• TRUE

• FALSE

Multiple Choice

If you are unable to make it to the bottom of the slide, who won the tug of war between sliding friction and gravity?

• There is no winner, and your sad because you're stuck on a slide

• Gravity won

• Neither, its a tie

• Sliding friction won

Multiple Choice

When most objects with smooth surfaces rub, there is less friction.

• True

• False

Multiple Choice

Heat is produced by which force?

• gravity

• friction

Multiple Choice

This car is turning, but there’s a puddle of water in the road. Which diagram best shows how the puddle will affect the path of the car after it hits the puddle?

Multiple Choice

On which surface will a toy car travel the slowest?

• Carpet

• Polished Wood

• Ice

Multiple Select

Which exerts the highest force?

• 100N

• 20N

• 2kg

• 190N

Take a pen and paper (or notebook) and draw the picture.

Add labelled force arrows for:

a. the push of the boy ( labelled P)

b. the weight of the box ((labelled W)

c. the contact force of the ground on the box (labelled C)

d. the friction of the ground on the box (labelled F)

Multiple Choice

REMEMBER: The Earth's gravity pulls with a force of 10 N on each kilogram.

Look at the picture. What is the mass of the book?

• 8 kg

• 80 kg

• 8 N

• 0.8 kg

Multiple Choice

Jon investigates the force of friction acting on a metal block as it slides on a wooden board.

Here are steps 1 to 4 in his method. They are in the wrong order.

Choose the correct order:

1. He stops lifting the board when the block starts to slip.

2. He places the block on the board.

3. He measure the angle of the board.

4. He carefully lifts the end of the board upwards.

• 2, 3, 4, 1

• 2, 4, 3, 1

• 2, 4, 1, 3

• 2, 1, 3, 4